Concrete-block composition



COATING R PLASTIC Patented Apr. 12, 1927.

cross uererence PATENT OFFICE.

E. VON MACH, 13,02 DETROIT, MICHIGAN.

CONCRETE-BLOCK COMPOSITION.

Io Drawing.

This invention relates to a composition of matter for building and structural purposes.

The object of the invention is to produce a material for the manufacture of building blocks which will possess great strength, which will be fireproof and soundproof, which will hold nails, which may be easily sawed and which will be lighter in weight than concrete blocks or gypsum blocks.

The composition consists of the following ingredients: cinders or ashes, cement, shavings or sawdust, hydrated lime, and plaster of Paris. The cinders or ashes will be crushed if necessary and screened so that the largest pieces will not exceed about a quarter of an inch in diameter. All of the ashes may be used, but in certain cases to prevent efllorescence, the soluble parts may be washed out by soaking the ashes in water until the bulk of the soluble material present has been dissolved, and in cases where the cinders con tain sulphur in combination, sulphuric or hydrochloric acids may be added to the water in sufficient quantity to dissociate the sulphides.

Ordinarily this washing and acid treatment will not be necessary and the entire residue from the combustion of coal may be used. By the term cement it is intended to include any ordinary form of Portland cement or hydraulic cement used in him manufacture of concrete.

The sawdust or shavings will preferably be free from large pieces of wood. Any finel wood-working operations may be used in place of sawdust, and where shavings are used they will preferably be crushed or shredded into line pieces.

In addition to the ingredients named, various other loose and light materials may be used as fillers, such as chalk. magnesia or asbestos.

e proportions may of course be varied within comparatively wide limits with corredivided wood resulting from various Application fled April 18, 1922. Serial No. 552,312. f 3

sponding variation in the qualities of the material, but the preferred proportions are n 'ately as follw o hour part oust or s avin s one part, two parts, and laster of Paris six par 9.

A modification comprises th mixture to which one part of asbestos is added.

A buildin block formed of the ingredients specific in the proportions 'ust stated does not soften with moisture, is ess brittle than a gypsum block, is lighter than a concrete block, and lighter than the so-called cinder cement block. It can easily be sawed and will not crack when nails are driven into it, but will hold the nails securely. It is fireproof and soundproof and forms an excellent material for interior partitions.

Blocks consistin of cement with cinders or ashes have hit erto' been proposed, but they are relatively expensive and heav The addition of sawdust does not material y decrease their fireproof qualities and the addition of lime and plaster of Paris makes the block li hter, diminishes its cost and --makes possib e the sawing of the block. The further addition of chalk, magnesia or asbestos, will yield a block less dense than one having a higher percentage of cement and for certain purposes this addition may be art, sawmade without sacrificing the other desirable qualities of the product.

I claim The process of forming a composition of matter which consists in subjecting residue of burned fuel to the action of a mineral acid to remove sulphides, washing the residue of burned fuel to remove the soluble matter and mixing the remainin portion of residue with cement. finely divi ed wood, lime and plaster of Paris.

In testimony whereof I afiix my signature.

MAXlMILlAN E. VON MACH, JR-

e preceding 

